1 files changed, 23 insertions, 3 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1bb52e2ca02e..cbee4199689c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -201,9 +201,6 @@ config X86_TRAMPOLINE
         depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
         default y
 
-config X86_CHECK_BIOS_CORRUPTION
-        def_bool y
-
 config KTIME_SCALAR
         def_bool X86_32
 source "init/Kconfig"
@@ -1062,6 +1059,29 @@ config HIGHPTE
           low memory.  Setting this option will put user-space page table
           entries in high memory.
 
+config X86_CHECK_BIOS_CORRUPTION
+        bool "Check for low memory corruption"
+        default y
+        help
+         Periodically check for memory corruption in low memory, which
+         is suspected to be caused by BIOS.  Even when enabled in the
+         configuration, it is disabled at runtime.  Enable it by
+         setting "memory_corruption_check=1" on the kernel command
+         line.  By default it scans the low 64k of memory every 60
+         seconds; see the memory_corruption_check_size and
+         memory_corruption_check_period parameters in
+         Documentation/kernel-parameters.txt to adjust this.
+
+         When enabled with the default parameters, this option has
+         almost no overhead, as it reserves a relatively small amount
+         of memory and scans it infrequently.  It both detects corruption
+         and prevents it from affecting the running system.
+
+         It is, however, intended as a diagnostic tool; if repeatable
+         BIOS-originated corruption always affects the same memory,
+         you can use memmap= to prevent the kernel from using that
+         memory.
+
 config MATH_EMULATION
         bool
         prompt "Math emulation" if X86_32